Forcing yourself to transpose potentially hundreds of songs, simply to prove a point, does not make you a better musician..........
I know Mustang Sally in C. I can play it with my eyes closed, completely ****-faced, while chatting up cute girls. Am I a better musician if I learn in it B because my band tunes down a half step and I want to be arrogant about it? No. I'm an idiot for wasting all that time.
You get lost by shifting one fret?
I go to blues jams all the time.
Any song can be called out in any key.
You have to adjust on the fly. If I had to stop and retune my bass every time, they would never ask me back.

